Heat saving furnace



Jan. 13, 1953 E, v, LANGEN 2,625,139

HEAT SAVING FURNACE Jan. 13, 1953 E v LANGEN 2,625,139

HEAT SAVING FURNACE Filed Feb' 20, 1951 2 SHEETS-SHEET 2 o INVENTOR. E15/m l/ Aft/Gaf NORA/Ey Patented Jan. 13, 1953 A.UNITED STATES PATENT o1=1=1cl=z-A HEAT SAVING FURNACE Eero V. Langen, Fitchburg, Mass.

Application February 20, 1951, Serial No. 211,863

1 Claim.

heating water in the furnace prior to exit of the gasses to therstack.

Another object of this invention resides in the provision of a new and improved heat saving furnace comprising .a firebox which is completely lsurrounded by a Water jacket, the top of which is intended to be used as a steam chest if it is desired to provide steam. there being a third outermost chamber or jacket, this chamber containing passages which direct the hot ue gases substantially completely around the water jacket and thereby apply heat to both sides of the water jacket for maximum eiiciency in heating the water, in the intermediate of the three chambers.

Other objects and advantages of the invention will appear hereinafter.

Reference vis to be had to the accompanying drawings in which Fig. l is a view in side elevation of the new furnace, parts being in section;

Fig. 2 is a front view thereof;

Fig. 3 is a section on line 3-3 of Fig. 2;

Fig. 4 is a section on line 4-4 of Fig. 1;

Fig. 5 is a view in side elevation illustrating the paths of the flue gases;

Fig. 6 is a view in rear elevation with parts in section;

Fig. 7 is an enlarged horizontal sectional view illustrating a. corner construction at the rear of the furnace;

Fig. 8 is a view in elevation illustrating one of the removable corner elements; and

Fig. 9 is a perspective View thereof.

The new and improved furnace comprising the inventionk in the present case, includes three separate chambers which are nested one within the other as clearly shown in Figs. 1, 3 and 4. The innermost chamber comprises a heavy wall I0 which forms the firebox and receives the burner I2. This burner, of course, extends through the other chambers as shown in Figs. 1 and 4.

There is a complete enclosure of the rebox occasioned by the walls I4; and the chamber I6 between walls I0 and I4 is the water jacket. It is therefore seen that water completely surrounds the rebox formed by walls I Il and the top of the water jacket as at I8 will accumulate the steam as will be clear.

A third jacket indicated by walls 20 completely surrounds water jacket I 6 except at the top and, of course, the walls 20 could be extended to surround the top also if this were believed to be advantageous. The three nesting walls forming the three chambers are appropriately spaced and braced by partitions and ribs so as to anchor them in position against any possibility of dislodgement. 'Ihe front wall as shown in Fig. 2 is provided with a fire door 22 and the Water jacket which is behind this door is apertured at 24 and a door 26 is provided to close this aperture.

The innermost chamber or rebox is provided with a slot at the rear thereof at 28 for the exit of the flue gases from the iirebox through the water jacket. A partition 30 just above the slot extends all the way across the rear portion of the outside chamber formed by walls 20, and this causes the ue gases to descend as at 32 as they cannot go in any other direction as will be more fully explained hereinafter.

The flue gases descending pass underneath the water jacket `at the lower portion thereof as at 34 and as shown by the arrows in Fig. 3, proceed forwardly and upwardly at 36 at the front of the furnace, being divided for the first time at the top of the chamber as indicated at 31, and thereupon progressing to the sides of the furnace and downwardly under the lower end or termination of a vertical partition or rib 38, there being one of these partitions at the right and left sides of the furnace.

The gases then progress upwardly, see particularly Fig. 5, passing to the rear of the furnace above the partition 30 and out at the stack flue at 40. By this time the gases are sufficiently cooled as to be no longer useful for heating purposes, and have progressed completely about the furnace except at the top, it .being considered that gas passages at the top of the steam chest portion would not be of suflicient avail to Warrant the use thereof.

The side portions of the gas passages which contain the partitions 38 are sealed off from the bottom at 34 by horizontal bailies or partitions 42 so that it is seen the gases must progress forwardly from the rear to the front under the bottom of the water jacket.

The present invention provides new and useful removable corner constructions which are best illustrated in Figs. 7, 8 and 9. Each of these corner constructions comprises an angular member 44 having a fastening means 46 for detachable securement to the walls 20, the latter being interrupted at the corners as clearly shown in Fig. 7 and also in Fig. 4. Each angular corner member 44 is provided with a im or baffle 43 which bisects the angle between the members making up the corner pieces 44. These fins or bales 48 eX- tend only part way of the lengths of the corner pieces 44 and terminate at partition 30 at the rear of the furnace, and at approximately the line 5 0 in Fig. 5 representing the top edge of 40 at the front of the furnace. The fins abut the corners of the walls 49, see Fig. 7, and form baiiies for the gas passages so that the gases cannot spread to the right and left sides at the rear position indicated at 32 nor can they spread to the sides at the front position indicated at 3S, but must` descend at 32, pass underneath the bottom of the y water jacket at 30, and up at 36 and for the rst time become separated to pass over partitions i8 at 50 and then as above stated down under the lower end of partition 3S thence upwardly and out at the flue. K

The partition 30 completely divides the rear portion of the flue gas chamber into two separate vertically displaced, substantially coplanar chambers and in combination with the angular ns or baflies 48 completely separates the rear chamber below partition 38 from the right and left sides, while achieving communication between the side and the rear upper chambers above partition 30.

It will be seen that this invention provides a new and improved heat saving furnace which is extremely economical to manufacture, install and operate. The new furnace extracts all the heat possible from the hot ue gases until the same are cooled to a point where they are no longer useful. It is to be observed that the removable corner constructions allow for cleaning of the flue passages as well as providing a relatively simple way in which to construct the corner partitions 48, and actually there are little or no areas of the flue passages which cannot be easily and quickly cleaned. The rebox walls I0 are preferably made of heavier material than the walls lli and 20, the latter being, of course, fabricated of rela tively lightweight materials. Pressure gauges, controls and water inlets and steam outlets may be provided as required or convenient and the entire furnace presents a modern appearance inA 4 spite of the fact that it contains the three chamber construction described.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed otherwise than as set forth in the claim, but what I claim is:

A furnace of the class described comprising a plurality of nesting completely separated chambers, a series of walls forming one of said chambers as a rebox, a second series of walls completely surrounding the iirebox in spaced relation thereto and forming an intermediate chamber about the rebox, a third series of walls substantially surrounding the intermediate chamber and forming a iiue gas chamber, a passage directing the flue gases from the irebox through the intermediate chamber into the ue gas chamber, said hue gas chamber comprising exhausting means directing said gases down under the bottom of the intermediate chamber, across the bottom, and upwardly at the front portion of the furnace, said means including a horizontal baille across the entire rear portion of the flue gas chamber above the passage, vertical baies at the corners of the rear portion of the flue gas chamber extending from the bale to the bottom o1' the flue gas passage, and partitions preventing dispersion of the flue gases at the front of the furnace, said partitions terminating short of the top of the ue gas chamber at the front, so that the gases vmay be divided and iiow over the sides of the intermediate chamber, and means directing the gases to the iiue at the rear of the furnace.

HERO V. LANGEN.

REFERENCES CITED The following references are of record in the le of this patent: 

